diff --git modules/profile.views.inc modules/profile.views.inc
index 75cb8ff..c2c0c4f 100644
--- modules/profile.views.inc
+++ modules/profile.views.inc
@@ -187,6 +187,7 @@ function profile_views_fetch_field($field) {
         'argument' => array(
           'handler' => 'views_handler_argument_string',
+          'accept_null' => TRUE,
         ),
       );
 
       break;